The 2018 Ram 4000 has 27 automatic transmission parts with verified fitment on this page — 12 part types and 8 brands, covering the 5.7L V8 engine. Each part includes a manufacturer part number and application notes.
On the 2018 Ram 4000, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. 15 parts of the 27 listed are Transmission Fluid Additive (6 parts), Transmission Fluid (5 parts) and Solenoid Switch Valve Plug (4 parts). The other 9 part types cover the remaining 12 parts.
Every part on this page is matched to the 5.7L V8 — the only engine offered in the 2018 Ram 4000.
The most listed brands for 2018 Ram 4000 automatic transmission parts are TRANSGO (9 parts), LUBEGARD (6 parts) and TRANSTEC (3 parts), plus 5 more brands. Quality grades include High Performance and Daily Driver.
3 parts on this 2018 Ram 4000 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including VALVOLINE 822348 (Transmission Fluid) and LUBEGARD 19610 (Transmission Fluid Additive). Click any part number to see every vehicle that part fits.
Accumulator Piston
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSGO | RFETCCACCUM | 🇲🇽 MX | TCC Accumulator Piston and Sleeve Kit | View on Amazon |
This table covers the pistons inside a transmission accumulator.
One part is listed for the 2018 Ram 4000 — TRANSGO RFETCCACCUM.
Fluid Cooler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 918545 | 🇲🇽 MX | View on Amazon |
This table covers the heat exchangers that cool transmission fluid. Typical signs include fluid that overheats, a leak at the cooler fittings, or milky fluid that says coolant and ATF have mixed. Flush the lines when you replace a cooler. Cross-contamination is how a small leak becomes a transmission job.
This group shows a single part: DORMAN 918545.
Fluid Cooler Line / Hose
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SUNSONG | 5802035 | 🇲🇽 MX | Inlet and OutletLocated on Transmission | View on Amazon |
This table covers the Fluid Cooler Line hoses. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle.
This group shows a single part: SUNSONG 5802035.
Fluid Pan
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 265870 | 🇲🇽 MX | OE FIX | View on Amazon |
This table covers the pans that hold automatic-transmission fluid.
One part is listed for the 2018 Ram 4000 — DORMAN 265870.
Fluid Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSTEC | 49444827 | 🇲🇽 MX | Crew45RFE, 5-45RFE, 65RFE | View on Amazon |
| VICTOR REINZ | 711953900 | 🇲🇽 MX | Crew ModelEnhanced Design | View on Amazon |
This table covers the gaskets that seal the Fluid Pan. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
2 Fluid Pan Gasket parts for the 2018 Ram 4000 come from 2 brands — TRANSTEC and VICTOR REINZ.
Listed part numbers: TRANSTEC 49444827 and VICTOR REINZ 711953900.
Rebuild Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSTEC | 81000518 | 🇲🇽 MX | without PistonsDuraprene Pan Gasket | View on Amazon |
This table covers the rebuild kits for this assembly.
One part is listed for the 2018 Ram 4000 — TRANSTEC 81000518.
Shift Improvement Kit
Daily Driver
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSGO | SK45RFEA | 🇲🇽 MX | Shift KitFor 45RFE, 545RFE, 65RFE, 66RFE, 68RFE Transmissions | View on Amazon |
High Performance
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSGO | 45RFEHD2A | 🇲🇽 MX | Reprogramming KitFor 45RFE, 545RFE, 65RFE, 66RFE, 68RFE Transmissions | View on Amazon |
| TRANSGO | RFE5BHP | 🇲🇽 MX | High Pressure Reprogramming KitWith Tuneless Technology | View on Amazon |
This table covers the Shift Improvement kits.
3 Shift Improvement Kit parts for the 2018 Ram 4000 come from TRANSGO.
In the Daily Driver grade, TRANSGO supplies 1 part: grouped for everyday commuting duty. A representative part number is TRANSGO SK45RFEA.
The High Performance section lists 2 options from TRANSGO — engineered beyond original-equipment specification. TRANSGO 45RFEHD2A is listed in this group.
Listed part numbers: TRANSGO SK45RFEA, TRANSGO 45RFEHD2A and TRANSGO RFE5BHP.
Solenoid Switch Valve Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSGO | RFESV420NT | 🇲🇽 MX | Solenoid Switch Valve Repair KitWithout Tools | View on Amazon |
| TRANSGO | RFESV453NT | 🇲🇽 MX | Solenoid Switch Valve Repair KitWithout Tools | View on Amazon |
| TRANSGO | RFESV420WT | 🇲🇽 MX | Solenoid Switch Valve Repair KitWith Tools | View on Amazon |
| TRANSGO | RFESV453WT | 🇲🇽 MX | Solenoid Switch Valve Repair KitWith Tools | View on Amazon |
This table covers the Solenoid Switch Valve plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes.
TRANSGO supplies the 4 Solenoid Switch Valve Plug parts for the 2018 Ram 4000.
Listed part numbers: TRANSGO RFESV420NT, TRANSGO RFESV453NT and TRANSGO RFESV420WT, plus the other parts above.
Torque Converter Clutch Valve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSGO | RFETCCREGOS | 🇲🇽 MX | Oversized Converter Regulator Valve | View on Amazon |
This table covers the Torque Converter Clutch valves. Typical signs include a circuit that will not hold, a whistle, or a code for this valve. A stuck valve is often debris. Clean the ports before installing the new one.
One part is listed for the 2018 Ram 4000 — TRANSGO RFETCCREGOS.
Transmission Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | 822348 | 🇲🇽 MX | ATF + 41 Quart | View on Amazon |
| PENTOSIN | 1058112 | 🇲🇽 MX | ATF441 Liter | View on Amazon |
| PENTOSIN | 1058212 | 🇲🇽 MX | ATF445 Liters | View on Amazon |
| VALVOLINE | 883587 | 🇲🇽 MX | ATF + 41 Gallon | View on Amazon |
| VALVOLINE | 886642 | 🇲🇽 MX | ATF + 45 Gallon | View on Amazon |
This table covers the automatic-transmission fluids specified for this gearbox. Typical signs include harsh or delayed shifts, fluid that smells burnt, or a shudder at light throttle. Use exactly the specification in the notes. Automatic transmissions are unforgiving of the wrong fluid.
5 Transmission Fluid parts for the 2018 Ram 4000 come from 2 brands — VALVOLINE and PENTOSIN. The "Popular" part is VALVOLINE 822348.
Part numbers include VALVOLINE 822348, PENTOSIN 1058112 and PENTOSIN 1058212, among others listed above.
Transmission Fluid Additive
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LUBEGARD Popular | 19610 | 🇲🇽 MX | Instant Shudder Fixx2 oz | View on Amazon |
| LUBEGARD Popular | 60902 | 🇲🇽 MX | Automatic Transmission Fluid Protectant10 oz | View on Amazon |
| LUBEGARD | 61910 | 🇲🇽 MX | 10 ozHighly Friction Modified ATF Supplement | View on Amazon |
| LUBEGARD | 63010 | 🇲🇽 MX | Platinum Universal ATF Protectant10 oz | View on Amazon |
| LUBEGARD | 63016 | 🇲🇽 MX | Platinum Universal ATF Protectant15 oz | View on Amazon |
| LUBEGARD | 63032 | 🇲🇽 MX | Platinum Universal ATF Protectant32 oz | View on Amazon |
This table covers the conditioners and additives used with this transmission fluid.
6 Transmission Fluid Additive parts for the 2018 Ram 4000 come from LUBEGARD. The "Popular" part is LUBEGARD 19610.
Listed part numbers: LUBEGARD 19610, LUBEGARD 60902 and LUBEGARD 61910, plus the other parts above.
Valve Body Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSTEC | 49434421 | 🇲🇽 MX | Crew45RFE, 5-45RFE, 65RFE | View on Amazon |
This table covers the gaskets that seal the Valve Body. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
One part is listed for the 2018 Ram 4000 — TRANSTEC 49434421.
Buying Automatic Transmission Parts for a 2018 Ram 4000
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Confirm you have the 5.7L V8 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Transmission Fluid Additive and Transmission Fluid .
Frequently Asked Questions
How many automatic transmission parts fit the 2018 Ram 4000?
Our catalog currently lists 27 automatic transmission parts for the 2018 Ram 4000 across 12 subcategories and 8 brands, covering the 5.7L V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of automatic transmission problems on a 2018 Ram 4000?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2018 Ram 4000 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2018 Ram 4000?
Every part on this page is matched to the 5.7L V8 engine. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Ram 4000
Automatic Transmission Parts for Other Ram 4000 Years
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